Assessment of interfacial mass transfer in water-unsaturated soils during vapor extraction

Journal of Contaminant Hydrology
S HoegJ Warnatz

Abstract

This paper presents results of a numerical investigation of soil vapor extraction (SVE) systems at the laboratory scale. The SVE technique is used to remove volatile chlorinated hydrocarbons (VCHC) from the water-unsaturated soil zone. The developed numerical model solves equations of flow, transport and interfacial mass transfer regarding an isothermal n-component and three-phase system. The mathematical model is based on a simple pore network and phase distribution model and designed to be scaled by a characteristic length. All mathematical expressions are structured into VCHC specific and VCHC non-specific parameters. Furthermore, indicators are introduced that help to separate thermodynamic equilibrium from thermodynamic non-equilibrium domains and to determine the controlling physical parameters. For numerical solution, the system of partial differential equations is discretized by a finite volume method and an implicit Euler time stepping scheme. Computational effort is reduced notably through techniques that enable spatial and temporal adaptivity, through a standard multigrid method as well as through a problem-oriented sparse-matrix storage concept. Computations are carried out in two dimensions regarding the laboratory...Continue Reading

References

Jul 10, 1959·Science·R J Millington
Nov 1, 1994·Environmental Science & Technology·M A Schlautman, J J Morgan

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Citations

Jul 6, 2014·Journal of Contaminant Hydrology·Mojtaba G MahmoodluAmir Raoof
Aug 19, 2007·Clinical and Experimental Immunology·C BacchelliH B Gaspar
May 24, 2008·Environmental Science & Technology·Molly S Costanza-RobinsonRoss M Lieb-Lappen
Jul 26, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Lixia Chen, Tohren C G Kibbey

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